[uml-devel] TLS support - status - need for re-testing

[Blaisorblade <blaisorblade@yahoo.it>]

I've integrated "linux-unistd" from Jeff series, while leaving out 
"user-desc" (I've solved the problem another way, which should work on both 
host header set - we give our own definition for userspace files, and use our 
one for kernelspace, but give the resulting type the name of "user_desc_t").
Jeff, I've looked at all other patches _names_ and they're patches which I 
already have, so I shouldn't have lost any other changes.

Plus, I've just done a couple of other cleanups of the TLS code, removing dead 
code which was there for experiments; I've implemented 2.4 host detection (I 
hope I've not forgot to check the host_supports_tls variable anywhere), and 
I'm ripping out global-ldt-sem which I longly hated (and which isn't easy to 
avoid).

I've ripped it out by comparing header dependencies to i386; the result is 
that our additional dependency is from processor.h and ptrace.h on ldt.h, but 
they only depend on the user_desc declaration and not on the uml_ldt_t 
declaration (which is the one using the semaphore).

So I split the user_desc part away in a new header file, and this fixed the 
problem.

However, I tested seriously the new code and it doesn't work with apache2 
mpm-worker nor with simpler tests.... I hadn't run such tests recently, and I 
now see that the code does assumptions which are wrong on x86_64 hosts.

Has anyone got success or failure with TLS code on 32-bit machines on 64-bit 
hosts?

More important: has anyone tested that?
-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade


	

	
		
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